Un-Habitat 3.1 Mangrove Plantations for Improved
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UN-HABITAT 3.1 MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE UN-HABITAT MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE INTRODUCTION Problem statement Mangrove ecosystems are rapidly declining in many parts of the world. This has resulted in the loss of important environmental and economic products and services including agricultural products, flood mitigation and nursery grounds for fish. Deliverables Delivery of mangrove plantation for coastal resiliency Beneficiaries 17,754 Budget $208,704 (USD) Location All Communes MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 1 UN-HABITAT Consultations with local communes in Kep Province and Prey Nob District have identified that coastal communities are being impacted by climate change and its effects on the coastal environment, leading to the serious consequences for local people. The identified environmental impacts listed below can be attributed to a combination of declining mangrove ecosystems and/or insufficient coverage by existing mangrove reserves and the impacts of climate change: • Significant reduction in fish levels for local fishermen and women; • Coastal erosion leading to loss in coastal agricultural land and damage to coastal infrastructure; • Storm surges resulting in salt water ingress into the local agricultural land and surface water, resulting in decreasing agricultural productivity and surface water availability; • Reduced resilience of houses in the coastal area to flooding and high winds, contributing to potential loss of life and property damage. This investment will plant mangroves along the coast in Prey Thom, Kep Pong Teuk and Angkaol Communes in Kep Province and Prey Nob Commune in Prey Nob District establish mangrove protected areas in these locations. The case of environmental and socio-economic benefits for this investment are strong: as per the International Federation of Red Cross and Red Crescent Societies (IFRC) study dated 2011 Mangrove plantation in Viet Nam: measuring impact and cost benefit the plantation of mangroves over a 30-year period is estimated to provide benefits per hectare of mangrove plantation 28 to 104 times the initial establishment costs. MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 2 UN-HABITAT Location The selected locations for mangrove plantation in this investment are all in area classified as ‘state public land’, and thus do not impact private land, but provide protection to land behind the plantations as well as preventing coastal erosion, and supporting marine biodiversity through increased fish and crab spawning areas. Land maps below are coloured based on the anticipated chance of that proposed plantation will achieve all criteria within the Mangrove Planting Management Plan and be targeted for plantation: Green – target areas for the project where there will strengthen the existing mangrove plantation Yellow – Proposed new mangrove plantations, supported by the project Red – alternative locations for mangrove plantation if the situation of land ownership or suitability for plantation of the yellow areas changes between now and the start of the project implementation • Green: Areas indicated in green are areas where mangrove plantation is expected to be achieved with a very high probability of success; • Yellow: Areas indicated in yellow are areas where mangrove plantation s expected to be achieved with a high probability of success; • Red: Areas nominated in red are areas where mangrove plantation is expected to be achieved with a moderate probability of success. MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 3 UN-HABITAT Figure 1 “Proposed location for the mangroves in Kep Province” MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 4 UN-HABITAT Figure 2 “Proposed location of mangroves in Angkaol District” Figure 3 “Proposed location of mangroves in Prey Nob District” gure 2 “Proposed location of mangroves in Angkaol District” MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 5 UN-HABITAT Beneficiaries Key beneficiaries include: BENEFICIARIES REASON QUANTITY COST/ BENEFICIARY Local Fishermen Improved fishing yields resulting 1000 $11.52 from the improved marine ecosystem. As per the International Federation of Red Cross and Red Crescent Societies (IFRC) study dated 2011 Mangrove plantation in Viet Nam: Measuring impact and cost benefit mangroves have also had a positive impact on the provision of additional income for coastal communities through an increase in per hectare yield of aqua culture products such as shellfish and oyster by 209-789 per cent. Protection of Local Mangrove plantations provide 16, 754 $11.61 Infrastructure, protection against coastal Property and erosion, salt water ingress to rice Residents fields and protection of residents, infrastructure property against storm surges and other environmental impacts. As per the International Federation of Red Cross and Red Crescent Societies (IFRC) study dated 2011 Mangrove plantation in Viet Nam: Measuring impact and cost benefit mangroves can provide direct protective benefits between $800 and $3287 per Ha subject to site specific constraints. MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 6 UN-HABITAT BUDGET Mangrove Plantation LOCATION ZONE LAND SIZE (Ha) ALLOCATED BUDGET ($USD)(3) Kep Province Confirmed Mangrove Plantation 12.84 Ha $13,803 Zones High probability of success 24.5 Ha $18,436 mangrove plantation zones (1) Moderate probability of success 119.40 Ha $51,342 mangrove plantation zone (2) Prey Nob District Confirmed Mangrove Plantation 0 Ha $0.00 Zones High probability of success 129 Ha $97,072 mangrove plantation zones (1) Nursery Mangrove Nursery ($25,000) NA $28050 Establishment Costs TOTAL 285.74 $208,704 Notes: 1. Assumed that only 70% of the mangroves zones that have a high probability of being suitable are confirmed during the implementation phase. 2. Assumed that only 40% of the mangroves zones that have a moderate probability of being suitable are confirmed during the implementation phase. 3. Assumed plantation cost is $1075 per hectare ($850 with a 26% augmentation due to inflation) in accordance with IFRC (International Federation of Red Cross and Red Crescent Societies) paper ‘Mangrove plantation in Viet Nam: Measuring impact and cost benefit’ (2011) 4. Mangrove Nursery Costs based on paper entitled Sinohin, V., & Baconguis, S. (2000). Establishing a mangrove nursery. SEAFDEC Asian Aquaculture, 22(1), 7-8, 28-30 and with 1998 costs inflated at 3% per year. MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 7 UN-HABITAT DATA COLLECTION Inputs The following inputs were used for the development of this proposed investment.: • Consultations (refer to Part II, Section H – The Consultative Process) • Site Photographs (Refer to section XXX) • Historical mangrove studies (See IFRC, 2011) Consultations Consultations with the communes were undertaken to understand the impact of strong winds and flooding on the specific communes. The dates for relevant consultation sessions wherein vulnerability to strong winds and flooding hazards were identified are as follows: • 16 October 2018 - Meeting with Dr. Vann Monyneath • 17 October 2018 - Meeting with the Fisheries Administration, Kep Province • 17 October 2018 - Meeting with Department of Environment, Kep Province • 18 October 2018 - Meeting with the representatives of the target communes, Kep Province • 22 October 2018 - Consultation with the Eight Communes of Prey Nob District Key messages received from these consultation sessions are as follows: • Consensus that the cutting down of mangrove has resulted in greater instances of salt water ingress into agricultural land and surface water; • There is a clear understanding that mangroves provide substantial ecological and economic benefits (e.g. more robust fisheries and better protected agricultural land); • Limited budget in local communes to support mangrove preservation education campaigns; • In some areas, mangroves have been cut to enable the expansion of agricultural land. The Department of Environment has indicated that providing clear delineation between agricultural land and mangrove preservation zones (e.g. by construction of a road) has been very successful; • In areas where mangroves have been removed there has been increased coastal erosion; • On 18th October 2018 commune leaders in Kep Province indicated that 350-375m of mangrove is sought after to mitigate significant erosion of local beaches and prevent salt water ingress; • On 16th October 2018 Kep Municipality requested an 8km mangrove plantation along the west-facing Prey Thom coast; MANGROVE PLANTATIONS FOR IMPROVED COASTAL RESILIENCE 8 UN-HABITAT • Support for mangrove plantations and preservation of existing mangrove is consistent at all levels of government. Site Records • Site visits and review of areas selected for potential mangrove sites have confirmed the following: • Proposed sites for mangrove plantation are typically located at historical mangrove plantation locations and/or are located adjacent to existing mangrove plantations (refer to photo 1 as an example); • Where reduced mangrove depths relative to agricultural plots were identified, salinisation issues are noted by local residents and commune leaders as more prevalent; • Fishing community evident across all communes (refer to photos) Studies Sinohin, V., & Baconguis, S. (2000). Establishing a mangrove nursery. SEAFDEC Asian Aquaculture Technical Guidance Document for Mangrove Planting Permitting and Management